thanks for the advice. i do have a little xrite densitometer.
one thing you can always count on every roll: some dmax (the leader) and
some film base (space after last frame). i usually file both peices in
with my negatives so i can check them at a later date.
may i ask why do you pick -3 and +5 from normal exposure? this corresponds
to zone II and zone X. i usually benchmark to zone I (D=FBF+0.10) and
VIII (D=FBF+1.20).
thx
- -rei
> From: "Don Dory" <dorysrus@mindspring.com>
>
> Rei, the only sure test would be to create a test strip much as the
> commercial labs use. First frame blank, second frame gray card exposed per
> the meter, third frame minus three stops, fourth frame at plus five stops.
>
> To make this work you would have to create a standard set to compare with
> known good chemistry or from a well set up commercial lab that runs
> commercial test strips.
>
> The first frame tells you if your fix is any good or whether there is some
> source of dichroic fog in the system.
>
> The third frame tells you the speed point of the process. This needs to be
> looked at in conjunction with contrast as if this point rises as well as the
> middle gray then contrast stays the same but everything is overdeveloped or
> the fix is going south which you can tell from the blank frame.
>
> The second frame minus the third frame tells you the contrast index of your
> system. If the developer is just going south you will see it in the
> contrast assuming the FB + fog stays constant.
>
> The fifth frame indicates ability to create dMax, this would be important if
> you were experimenting with higher dilutions.
>
> All of the above implies the possession of a densitomiter or access to one.
>
> E-mail me if you have any questions.
>
> Don Dory
> dorysrus@mindspring.com
>
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- --
Rei Shinozuka shino@ubspainewebber.com 212-713-6256 FAX: 212-713-1482
UBS Warburg Fixed Income Quantitative Research, UBS Warburg LLC
1285 Avenue of the Americas, 11th Floor, New York, NY 10019-6028
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